package com.nondo.dean.platform.tool;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;

import com.swetake.util.Qrcode;

public class QRCodeUtils {
    /**
     * 生成二维码输出图片流
     * @param content
     * @param response
     */
    public static void encoderQRCoder(String content, HttpServletResponse response) {
        try {
            Qrcode handler = new Qrcode();
            handler.setQrcodeErrorCorrect('H');
            handler.setQrcodeEncodeMode('C');
            handler.setQrcodeVersion(12);

            System.out.println(content);
            byte[] contentBytes = content.getBytes("UTF-8");

            BufferedImage bufImg = new BufferedImage(200, 200, BufferedImage.TYPE_INT_RGB);

            Graphics2D gs = bufImg.createGraphics();

            gs.setBackground(Color.WHITE);
            gs.clearRect(0, 0, 200, 200);

            // 设定图像颜色：BLACK
            gs.setColor(Color.BLACK);

            // 设置偏移量 不设置可能导致解析出错
            int pixoff = 2;
            
            // 输出内容：二维码
            if (contentBytes.length > 0 && contentBytes.length < 124) {
                boolean[][] codeOut = handler.calQrcode(contentBytes);
                for (int i = 0; i < codeOut.length; i++) {
                    for (int j = 0; j < codeOut.length; j++) {
                        if (codeOut[j][i]) {
                            gs.fillRect(j * 3 + pixoff, i * 3 + pixoff, 3, 3);
                        }
                    }
                }
            } else {
                System.err.println("QRCode&nbsp;content&nbsp;bytes&nbsp;length&nbsp;=&nbsp;" + contentBytes.length
                    + "&nbsp;not&nbsp;in&nbsp;[&nbsp;0,120&nbsp;].&nbsp;");
            }

            gs.dispose();
            bufImg.flush();

            // 生成二维码QRCode图片
            ImageIO.write(bufImg, "jpg", response.getOutputStream());

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
